com.oneops.inductor.MessagePublisher.java Source code

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Here is the source code for com.oneops.inductor.MessagePublisher.java

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/*******************************************************************************
 *  
 *   Copyright 2015 Walmart, Inc.
 *  
 *   Licensed under the Apache License, Version 2.0 (the "License");
 *   you may not use this file except in compliance with the License.
 *   You may obtain a copy of the License at
 *  
 *       http://www.apache.org/licenses/LICENSE-2.0
 *  
 *   Unless required by applicable law or agreed to in writing, software
 *   distributed under the License is distributed on an "AS IS" BASIS,
 *   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *   See the License for the specific language governing permissions and
 *   limitations under the License.
 *  
 *******************************************************************************/
package com.oneops.inductor;

import java.util.Map;
import javax.jms.*;
import javax.jms.IllegalStateException;

import org.apache.activemq.ActiveMQConnection;
import org.springframework.jms.connection.CachingConnectionFactory;

import com.oneops.util.ReliableExecutor;

import org.apache.activemq.util.IndentPrinter;
import org.apache.log4j.Logger;

public class MessagePublisher extends ReliableExecutor<MessageHolder> {

    static Logger logger = Logger.getLogger(MessagePublisher.class);

    private long timeToLive;
    private boolean persistent = true;
    private String topic = null;

    private CachingConnectionFactory connectionFactory = null;
    private Connection connection = null;
    private Session session = null;
    private MessageProducer regularProducer = null;
    private MessageProducer priorityProducer = null;

    public void init() {
        try {
            connection = connectionFactory.createConnection();
            session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
            Destination queue = session.createQueue(topic);
            regularProducer = session.createProducer(queue);
            priorityProducer = session.createProducer(queue);
            priorityProducer.setPriority(6);

            if (persistent) {
                regularProducer.setDeliveryMode(DeliveryMode.PERSISTENT);
                priorityProducer.setDeliveryMode(DeliveryMode.PERSISTENT);
            } else {
                regularProducer.setDeliveryMode(DeliveryMode.NON_PERSISTENT);
                priorityProducer.setDeliveryMode(DeliveryMode.NON_PERSISTENT);
            }
            if (timeToLive != 0) {
                regularProducer.setTimeToLive(timeToLive);
                priorityProducer.setTimeToLive(timeToLive);
            }
        } catch (JMSException e) {
            logger.error(e.getMessage());
            logger.error(e.getMessage(), e);
        }
        super.init();
    }

    @Override
    protected boolean process(MessageHolder holder) {
        Map<String, String> event = holder.getMap();
        try {
            TextMessage message = session.createTextMessage(event.get("body"));
            message.setJMSCorrelationID(event.get("correlationID"));

            for (Map.Entry<String, String> kv : event.entrySet()) {
                if (!kv.getKey().equals("body")) {
                    message.setStringProperty(kv.getKey(), kv.getValue());
                }
            }

            MessageProducer producer = regularProducer;
            if ("high".equals(event.get("priority"))) {
                producer = priorityProducer;
                logger.debug("using priority producer to publish message");
            }

            producer.send(message);
            logger.debug("Published: " + message.toString());
            return true;
        } catch (NullPointerException npe) {
            // happens when amq session is null
            logger.warn("caught NullPointerException - reconnecting to broker");
            waitSome();
            init();
            return false;

        } catch (IllegalStateException e) {
            // this happens when connection is hosed - lets re-init
            logger.warn("caught IllegalStateException - reconnecting to broker");
            init();
            return false;

        } catch (JMSException e) {
            logger.error(e.getMessage());
            logger.debug(e.getMessage(), e);
            return false;
        }
    }

    private void waitSome() {
        try {
            Thread.sleep(10000);
        } catch (InterruptedException ex) {
            Thread.currentThread().interrupt();
        }
    }

    public void publishMessage(Map<String, String> event) {
        this.executeSync(new MessageHolder(event));
    }

    public void getConnectionStats() {
        ActiveMQConnection c = (ActiveMQConnection) connection;
        c.getConnectionStats().dump(new IndentPrinter());
    }

    public void cleanup() {
        System.out.println("Closing AMQ connection");
        closeConnection();
    }

    public void closeConnection() {
        try {
            regularProducer.close();
            priorityProducer.close();
            session.close();
            connection.close();
        } catch (Exception ignore) {
        }
    }

    public void setTimeToLive(long timeToLive) {
        this.timeToLive = timeToLive;
    }

    public void setConnectionFactory(CachingConnectionFactory cf) {
        this.connectionFactory = cf;
    }

    public void setTopic(String topic) {
        this.topic = topic;
    }

    public void setPersistent(boolean persistent) {
        this.persistent = persistent;
    }

}